<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
    <script>
        /*
        连续的备选字符
        */
        var a="hello world 123123";
        var reg=/[a-z]/g;
        console.log(a.replace(reg,"*"));
        var reg1=/\d/g;
        console.log(a.replace(reg1,"*"));
        
    </script>
</body>
</html>